[Sgt.TheDarkness]

If your IP addresses are binded on the same network interface, chances are a DDoS attack is going to take it offline anyways. There is no such mitigation method you speak of that involves using IP addresses on the same server.

I have seen someone do something similar but I'm not sure how well their endeavors were, if both IP addresses are forward facing and exposed, an attacker sees this as no different than the rest.